[Bug 224682] New: Colour Channel Mixer ui & usability

["Jens Müller"]

https://bugs.kde.org/show_bug.cgi?id=224682

           Summary: Colour Channel Mixer ui & usability
           Product: digikam
           Version: unspecified
          Platform: Ubuntu Packages
        OS/Version: unspecified
            Status: NEW
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: [hidden email]
        ReportedBy: [hidden email]


Version:           1.1 svn (using KDE 4.3.4)
Installed from:    Ubuntu Packages

When using colour channel mixer tool I discovered the following behaviour:
1. open tool, red histogram channel should be selected with the given values of
red:100, green: 0, blue: 0
2. I push the reset button behinds the red value box
3. red is zero now, ok this can easially be fixed

Next if you select another histogram channel, for example green the green
slider and box gets a value of 100 and blue and red 0. Not understandable to
the user why values change when you only change the view of histogram. Also,
why can I have different values for blue when switching between red and green
histogram channel? BTW, to which unit do the values align?

And the last question: What is the big difference between colour channel mixer
tool and colour balance tool? For me this looks only like two guis for the same
image operation, right?

Jens

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[Gilles Caulier-4]

https://bugs.kde.org/show_bug.cgi?id=224682


Gilles Caulier <[hidden email]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|general                     |Channel Mixer
            Version|unspecified                 |1.1.0
            Product|digikam                     |digikamimageplugins
            Summary|Colour Channel Mixer ui &   |Color Channel Mixer ui &
                   |usability                   |usability




--- Comment #1 from Gilles Caulier <caulier gilles gmail com>  2010-01-29 08:38:52 ---
Channel Mixer is generally a tool to mix channel together and make black and
white images.

I have used histogram channel combo to setup mixer chanel, to not duplicates
settings here. Try gimp channel mixer tool to compare. The code is ported from
gimp to digiKam with 16 bits color depth support.

Gilles Caulier

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["Jens Müller"]

https://bugs.kde.org/show_bug.cgi?id=224682





--- Comment #2 from Jens Mueller <tschenser gmx de>  2010-01-29 19:27:36 ---
Yes Gilles, Gimp behaves the same. It's perfect to do black & white images, but
I do still not understand why there are different settings per channel (gimp
also). I have to dive deeper in this. A the moment channel mixer tool makes
only sense with monochrome option always on for me.

As I mentioned colour balance tool: gimp can do it with hightlights|midtones|
shadows and has also a preserve luminosity option. It would be nice to have
this also in digikam, do you think so?

Jens

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[Johannes Wienke-3]

https://bugs.kde.org/show_bug.cgi?id=224682





--- Comment #3 from Johannes Wienke <languitar semipol de>  2010-01-29 20:21:27 ---
With the channel mixer you can also change the brightness of the image and also
use a channel as a weighted subtraction whereas the balance tool doesn't allow
this and has another focus.

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["Jens Müller"]

https://bugs.kde.org/show_bug.cgi?id=224682


Jens Mueller <[hidden email]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |INVALID




--- Comment #4 from Jens Mueller <tschenser gmx de>  2010-01-30 10:12:26 ---
Yes Johannes, weihtened subtraction is the keyword. Most of this entry is
invalid. If I think about, everythink is clear. But perhaps we can make things
more clear for beginners. Some suggestion would be to rename the "channel"
label to "mix channel" or "ouput channel" as gimp. But "output channel" is not
the best, as the top right histogram is always output. Another option would be
to have a second "mix channel" drop down box between histogram and mixer
sliders and make histogram independent of shown mixer settings. Then we can
also add a "colours entry" to the histogram channel drop down box.

What do you think about?

Jens

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["Jens Müller"]

https://bugs.kde.org/show_bug.cgi?id=224682





--- Comment #5 from Jens Mueller <tschenser gmx de>  2010-01-30 11:31:10 ---
SVN commit 1082351 by jmueller:

make the single channel reset toolbuttons work to point to per channels
defaults
CCBUGS: 224682

 M  +12 -0     channelmixertool.cpp  


WebSVN link: http://websvn.kde.org/?view=rev&revision=1082351

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[Gilles Caulier-4]

https://bugs.kde.org/show_bug.cgi?id=224682

Gilles Caulier <[hidden email]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Version Fixed In|                            |1.1.0

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[bugzilla_noreply]

https://bugs.kde.org/show_bug.cgi?id=224682

[hidden email] changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|Channel Mixer               |Tool-Channels
            Product|digikamimageplugins         |digikam

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